Manuel Lanzini has signed a West Ham contract worth £21.8million in total, Football Insider sources understand.

The 23-year-old attacking midfielder has completed a permanent transfer to Upton Park after putting pen to paper on a deal worth £70,000-a-week.

Jack Sullivan, the son of joint West Ham chairman David Sullivan, Tweeted on Tuesday morning that Lanzini has agreed a four-year deal with the option to extend for a further two years.

If both parties take up the option to extend until 2022, the deal will be worth £21.8million plus top-up bonuses in addition to the transfer fee of around £7.5million. In total, it could amount to a £29.3million deal.

The 23-year-old attacking midfielder has been on a season-long loan at West Ham from Al Jazira in the United Arab Emirates and has impressed sufficiently for manager Slaven Bilic to sanction a permanent contract.

The Argentine, is set to more than double his current salary of £30,o00-a-week, follows Dimitri Payet and Cheikhou Kouyate in agreeing a new contract.

West Ham chairman David Sullvian revealed earlier in the season that his club had a “watertight” agreement in place to make Lanzini’s loan a permanent transfer.

Lanzini is a WHU player for the next 4 seasons, with a further 2 year option.#COYI